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MOT for Freelander - 2 wheel brake tester ? (AGAIN !)

Discussion in 'Land Rover Freelander' started by Joe_H, Jun 17, 2016.

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  1. GrumpyGel

    GrumpyGel Well-Known Member Full Member

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    Interesting theory - not sure I agree with it, because I've never heard of a Freelander's tranmission going bang at a testing station - which if it was a primary contributing reason for failure it would be likely to occur there regularly.
     
  2. Joe_H

    Joe_H Well-Known Member

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    Sheesh and gawd damn :rolleyes:
    I DID lol :D
    No wonder Kiwi fruits are higher priced than Marijuana...................................

    4 (four) wheel Drive....[​IMG]

    tum te tum te tum ....;)
     
  3. Joe_H

    Joe_H Well-Known Member

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    I think it may well be a contributing factor to failure - not necessarily at the time - I think excessive loading leads to weakening of - or initial damage to components or - more likely - instigation of the primary damage to the components - this then progresses... the damage is done - the failure is the result of the unit(S) further down the line.
    Fatigue failures are not (usually) instantaneous) - rather they are progressive.
    Hypothesis but hey ....... :)
     
  4. Nodge68

    Nodge68 Well-Known Member

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    I normally remove my VCU for the MOT as I like to see the brake performance and if there is any bias to one side or another. I refit the props after the test is done, knowing that the brakes are A 1.
     
  5. Tonyj66

    Tonyj66 Active Member

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  6. dave21478

    dave21478 Active Member

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    Here in france when the tester inputs the vehicle data at the start of the test the computer flags up that it needs the extra rollers put down for the brake test. This is just a heavy frame with a pair of rollers that is laid on the floor behind the standard brake tester so the rear wheels sit on it and can spin freely as the fronts are tested. It then needs picked up and dragged to the front of the tester so the front wheels sit on it as the rears are tested.

    Last test, the guy obviously couldnt be bothered so he just tried to test as a normal 2wd car. When the rollers start turning the front wheels, they encounter abnormal resistance as the VCU tries to turn the rear wheels so he couldnt get a baseline reading of whether the brakes were binding or not. Further insistance trying to get a reading meant that the rear wheels started to turn and pushed the car off the rollers.
    No damage done....its only for a few seconds at a time, and no different to having a pair of wheels stuck in sticky mud. The more you insisit with the rollers, the harder the VCU locks up and either the rear wheels will slip on the garage floor or will push the car forwards out of the tester. I guess if your IRD was on the point of failure anyway this could provoke it to break, but a healthy one should be able to take this kind of abuse for a reasonable period of time.
     
  7. Skinny Mike

    Skinny Mike Well-Known Member

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    To put it bluntly, I've no sodding idea why they lock the front and rear rollers and test just one axel when they've done them with the wheels left to rotate. But that's what they always do. It's all over within 2 minutes, and no damage has ever been done.
    The Freelander doesn't go back in for its test til November, but I shall do my best to remember and ask.
    As for the bit about 2wd, I had verbal diarrhoea and couldn't stop:)
    Mike
     
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  8. Joe_H

    Joe_H Well-Known Member

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    Hi Dave, you raise an interesting and somewhat valid point - that being that in most circumstances the transmission should be quite able to deal with the issues and make the test - basically - not possible - due to the vehicle forcing itself of the rollers.. However, the testers who are not aware of the issues tend to do the following (as they normally do on a 2WD vehicle - they place - what they consider to be the 'driven' wheels on the 2WD rollers and then apply the hand brake if they consider the unit to be an FWD unit - as many do with the FL. Now you are forcing against the handbrake locking the rear wheels. My FL handbrake - after much trials and tribulations - is absolutely superb ! - anyone that locks that and then applies drive to the front wheels is applying a huge load on the transmission - without the handbrake - this would not necessarily be the case.
    Some great points are being highlighted here - thanks all for a good discussion.
    Joe
     
  9. dave21478

    dave21478 Active Member

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    But if the rear wheels are locked with the handbrake then when the rollers try to turn the fronts the VCU will tighten and the front wheels will lock up too, making a brake reading impossible.
    IMO tyres will slip on the rollers before damage is likely to be done.
     
  10. Joe_H

    Joe_H Well-Known Member

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    Ah, I knew it must be in there somewhere ! - from RAVE -

    Brake testing on a two wheel brake test dyno - you must REMOVE rear prop-shaft.

    The MOT brake test rollers are a two wheel dynamometer

    That is direct from Land Rover :cool:

    freelander Brake Test.jpg

    Had to be documented somewhere...............:rolleyes:
     
  11. Joe_H

    Joe_H Well-Known Member

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    And same for the non abs
    Brake test non abs.jpg

    Joe. ;)
     
  12. Joe_H

    Joe_H Well-Known Member

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